The DP-R410-T420 from AceWavetech is a RF Duplexer with Frequency 420 to 430 MHz(TX), 410 to 412 MHz(RX), Band 1 420 to 430 MHz(TX), Band 2 410 to 412 MHz(RX), Insertion Loss 1.5 dB, Isolation 65 dB. Tags: Module with Connectors. More details for DP-R410-T420 can be seen below.